#include<iostream>
#include<string.h>
using namespace std;

int main()
{
    char word[100],letter[13]={'l','e','a','d','i','n','g','u','v','r','s','t','y'};
    cin>>word;
    int sum=0;
    if(strlen(word)==17)
    {
        for(int i=0;i<13;i++)
        {
            for(int j=0;j<strlen(word);j++)
            {
                if(word[j]==letter[i])
                {
                    sum++;
                }
            }
        }
        if(sum==17)
        {
            cout<<"Leading University"<<endl;
        }
        else
        {
            cout<<"Impossible"<<endl;
        }
    }
    else
    {
        cout<<"Impossible"<<endl;
    }
    return 0;
}